Brake cylinder



Sept. 1932- c. c. FARMER ET AL 1,879,667

BRAKE CYLINDER- Filed Oct. 1 1. 1927 INVENTORS CLYDEC-FARMER ATTO EY Patented Sept. 27, 1932 UNITED STATES were? BRAKE CYLINDER Application filed October 11, 1927. Serial No. 225,486.

This invention relates to brake cylinders as employed in a fluid pressure brakesystem on railway cars. c

With the usual brake cylinder, trouble has been experienced, due to water and dirt collecting in the chamber at the non-pressure side of the brake cylinder piston. Whenthe brake cylinder piston moves toward release position, air from the atmosphere enters the I chamber around the loosely fitting piston rod,

and since the clearance space around the piston rod is relatively small, air rushes in with considerable velocity, carrying with it ,dirt and moisture.

Moisture collecting in the brake cylinder causes rusting, and in cold weather tends to freeze on the inner wall of the brake cylinder. Dirt or other foreign matter which may enter the brake cylinder acts as an abrasive and tends to unduly wear the brake cylinder piston packing.

The principal object of our invention :is to provide means for preventing-the accumuthe brake cylinder. r

In the accompanying drawing; Fig; 1 is a view of a brake cylinder partly sectioned, and showing our invention applied thereto; Fig. 2 an enlarged sectional-view of a portion of the bag employed to prevent dirt and moisture from accumulating on the wallsof the brake cylinder; Fig. 3 an enlarged sectional view of another portion of said bag; and Fig. 4: a section of a portion of the bag.

The brake cylinder 1 as shown in the drawing is of the usual construction containing a piston 2 having a piston rod 3, which extends out through an opening in the non-pressure head 4, the brake cylinder piston 2 being tending to urge the piston to its release position.

Accordingto our invention, for preventing the accumulation of dirt and moisture on the interior cylinder walls of the brake cylinflange at the inner face.

der, at the non-pressure side of the piston, a bag or bellows isprovided havin a conical body portion 7, preferably of duc with the inner face coated with rubber composition 8, and a smaller conical neck portion 9, preferably of plain or untreated duck.

The outer end of the bag is provided-with a flange 10 which may be formed by slitting the end portion of the body 7 and turning the slitted portions to form'the flange, a strip 11 of fabric and rubber compositioncut on the bias being applied and cemented to the Beioreapplying the strip 11, the end portion of the flange is folded on itself to enclose a ring 12, preferably of brass wire, as

shown in F ig.

At intervals,corresponding with the spacing of the clamping bolts 13, the flange 10 is provided with openings adapted to receive grommets 14, preferably of brass, a flat metal 'ringl5 being applied to the fabric, before the inner flange of the grommet is turned lation of dirt and moisture on the walls of down. 1

The :neck portion 9 is provided with a sec- 1 may be secured in place by sewing.

At the extremeend, the neck portion is provided with a flange section on opposite sides of which are placed flat metal rings 18, c

which are preferably secured to the neck flange by rivets 19.

The spring engages the inner ring 18 and presses the flange section of the neck portion 9 against the face of the piston 2. acted upon by the usual release spring 5,

7 so as to clamp the non-pressure head to the brake cylinder body, with the flange of the bag interposed.

' CLYDE c. FARMER, orrrrrsnnnen, AND JosnrH c. MCCUNE, or nnenwoon, rENNsYL- VANIA, ASSIGNORS TO THE WESTINGHOUSE AIR BRAKE COMPANY, DING, PENNSYLVANIA, A conroRA'rIoN or PE NSY VANIA v The body portion 7 of the bag is interiorly.

coated with rubber composition, so as to render the bag waterproof and thus preventleakage of water through the bag to the cylinder walls. I I, L

The neck portion 9 is made of plain duck,

the fabric. This is for the purpose of preventing the build-up; of pressure in the space betwe n the walls of the. bag and the brake cylinder walls, when the brake cylinder piston move to apply the brakes, since such build-up of pressure would tend to collapse the bag. The wire ring l7 serves to prevent the collapse of the bag whenthe brakecylinder piston moves to apply the brakes. The engage rnei it of the usual rel'eas'espring 5 with the flanged section of the bag operates to maintain the bag in position and insure its movement with the brake cylinder piston in applying and releasing the brakes. While one illustrative embodiment "of the invention has been described in detail, 'it is not my intention to limit its scope to that embodiment or otherwise than by the terms of theappende'd claims.

Having now described our invention, what we claim as new-and desire to secure'by Letters Patent, is

1. The combination with a brake cylinder containing a piston and having a non-pres sure head, and a piston rod connected to said piston and extending through an opening in said head, and a flexible bag disposed in the cylinder between the n'on pressure head and the piston and detached from said piston for collecting foreign matter enteringthe cylinder around the piston rod. s

2. The combination with a brake cylinder, of;a flexible fabric bag mounted in said cylinder at the non -pressure 'side,'for preventing the deposit of dirt andmoistu're on the intefirior wails of the cylinder, a portion of said bag being porous to permit passage of air.

The combination with a brake cylinder, of 'aflexible bag mounted in said cylinder for preventing the deposit :of foreign matter on the cylinder walls, aportiongof the bag being of porous material and another portion of ironporous material. 7

4. The combination with a brake cylinder, a piston and having a non-pressure head and a piston rod connected to said'pistonand exof thebo'd'y and neck portions.

tending through an opening in said head, of a flexible bag mounted in said cylinder between the non-pressure head and the piston, said bag' comprising a body portion made of non-porous material and a neck portion made of porous'material.

5. The combination with a brake cylinder, of a flexible dirt collecting bag mounted in said cylinder and having a flange section and a inetallic'ring carriedby said flange section for maintaining the shape of the flange.

6. The combinationwith a brake cylinder, ofa flexible dirt collecting bag mounted in said cylinderand having a metallic ring secured thereto at a point intermediate the ends of thebag. i

7. The combination with a brake cylinder,

of a flexible dirt collecting bag mounted in so that air may flow through the'meshes of said cylinder and having a body portion pro- 'v id'ed with a flange section and a neck portion, a metal ring secured to the flange section, and a metal ring secured at the juncture of the body portion. with the neck portion. 1

9. The combination with a brake cylinder,

"of a flexible dirt collecting bag mounted in said cylinder and having a conical body por tion and a smaller'coni cal neck portion and ametal ring secured to the bag at the juncture 10. The combination with a brake cylinder, 2. piston mounted therein, and a release spring, of a flexible bag mounted in said cylinder and having a portion interposed betweeirsaid spring and said piston.

11. The combination with a. brakecylinder having a non-pressure head-and a piston mountedin said brake cylinder, of a flexible bag disposed in said cylinder between the non-pressure head and the piston, said bag having aflan-ge at one end, and a spring interposed between the non p'ressure head and said flange and adapted to press'the flange against the piston.

.12; The combination with a brake cylinder having a non-pressure head and a jPiStOIl mounted in said ibrake cylinder, of a flexible bag disposed insaid cylinder andhaving a flangeseotion atone endclamped between the noni-pressu'reheadand the brake cylinder.

13. The combination with a brake cylinder, piston ,mounted therein, -a non pressu-re head, and a release spring acting'onsai d-pis ton, ofa flexible bag mounted insa-id cylinder between the non-pressure head and the piston and having a flange clamped between the non-pressure head and the brake cylinder and a "flange interposed between said spring and the piston. I

The combination with a brake cylinder 1...=

containing a piston and having a non-pressure head, of a flexible bag disposed in the brake cylinder between the non-pressure head and the piston, said non-pressure head being provided with an opening for permitting the drainage of moisture collecting in, the bag.

In testimony whereof we have hereunto set our hands this 7th day of October, 1927. CLYDE C. FARMER.

JOSEPH G. MGOUNE. 

